FACEBOOK Hacked, No User Data Compromised

Facebook Says It Was Hacked but No User Data Compromised

Daniel Acker | Bloomberg | Getty Images

Facebook said on Friday it was the target of a series of attacks from an unidentified hacker group, but no user data were compromised.

"Last month, Facebook security discovered that our systems had been targeted in a sophisticated attack," the company said in a blog post. "The attack occurred when a handful of employees visited a mobile developer website that was compromised."

The company said as soon as it discovered the presence of malware, it "remediated all infected machines, informed law enforcement, and began a significant investigation that continues to this day."